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		<h1 id="0093-an-alternate-way-to-gather-window-stats">0093: An Alternate Way to Gather Window Stats</h1>

<p>In the two previous blog posts, we looked at how to gather size, position and maximize state info and—if you didn’t think I was serious before—we’re looking at it one more time.</p>

<h2 id="one-signal-tells-all-sort-of">One Signal Tells All… Sort of</h2>

<!-- 0, 1 -->
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		Results of this example:
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			<img id="img0" src="../images/screenshots/001_window/window_13.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
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			Current example output
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		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/001_window/window_13_alt_window_stats.d" target="_blank">here</a>.
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<p>The <code class="language-plaintext highlighter-rouge">configure-event</code> struct gives us access to almost all the info we need. It tells us the <code class="language-plaintext highlighter-rouge">Window</code>’s dimensions and its position in some rather obvious fields:</p>

<ul>
  <li><code class="language-plaintext highlighter-rouge">x</code> and <code class="language-plaintext highlighter-rouge">y</code> store the position, and</li>
  <li><code class="language-plaintext highlighter-rouge">width</code> and <code class="language-plaintext highlighter-rouge">height</code> store the dimensions.</li>
</ul>

<p>We still have to go elsewhere for the maximized state, but that’s no big hardship.</p>

<p>Anyway, let’s dig in…</p>

<h2 id="the-constructor">The Constructor</h2>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">this</span><span class="p">()</span>
<span class="p">{</span>
	<span class="k">super</span><span class="p">(</span><span class="n">title</span><span class="p">);</span>
	<span class="n">addOnDestroy</span><span class="p">(&amp;</span><span class="n">quitApp</span><span class="p">);</span>
	<span class="n">addOnConfigure</span><span class="p">(&amp;</span><span class="n">onConfigureEvent</span><span class="p">);</span>
		
	<span class="n">appBox</span> <span class="p">=</span> <span class="k">new</span> <span class="n">AppBox</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
	<span class="n">add</span><span class="p">(</span><span class="n">appBox</span><span class="p">);</span>
		
	<span class="n">showAll</span><span class="p">();</span>
		
<span class="p">}</span> <span class="c1">// this()</span>
</code></pre></div></div>

<p>This has reverted back to the same state we saw in our first demo in <a href="./0090-window-stats-i-position.html">Blog Post #90</a>, proving that we really only need to work with the one signal (<code class="language-plaintext highlighter-rouge">configure-event</code>) to get what we need for a configuration file.</p>

<h2 id="the-ondestroy-callback">The onDestroy() Callback</h2>

<p>I’ll throw this in so you can see exactly where we’re reporting (or, in the real world, storing) the info we gather:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="n">quitApp</span><span class="p">(</span><span class="n">Widget</span> <span class="n">widget</span><span class="p">)</span>
<span class="p">{</span>
	<span class="nb">string</span> <span class="n">exitMessage</span> <span class="p">=</span> <span class="s">"Save the window stats for next time the user runs this application."</span><span class="p">;</span>
	<span class="n">writeln</span><span class="p">(</span><span class="n">exitMessage</span><span class="p">);</span>
	<span class="n">writeln</span><span class="p">(</span><span class="s">"xPosition: "</span><span class="p">,</span> <span class="n">xPosition</span><span class="p">,</span> <span class="s">", yPosition: "</span><span class="p">,</span> <span class="n">yPosition</span><span class="p">,</span> <span class="s">", width: "</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="s">", height: "</span><span class="p">,</span> <span class="n">height</span><span class="p">);</span>
	<span class="n">checkMaxState</span><span class="p">();</span>
		
	<span class="n">Main</span><span class="p">.</span><span class="n">quit</span><span class="p">();</span>
		
<span class="p">}</span> <span class="c1">// quitApp()</span>
</code></pre></div></div>

<p>All the stats are pulled from local variables (remember: we have to store them before the <code class="language-plaintext highlighter-rouge">Window.onDestroy</code> signal fires) and reported here as the program exits.</p>

<p>But now let’s get into the alternate stuff…</p>

<h2 id="where-are-those-window-stats-again">Where are Those Window Stats Again?</h2>

<p>Well, they’re where they always were. In fact, the maximize state can only be found in the <code class="language-plaintext highlighter-rouge">Window</code> property list, but the rest of the stats can also be found in the <code class="language-plaintext highlighter-rouge">configure-event</code> struct.</p>

<p>And the <code class="language-plaintext highlighter-rouge">ConfigureEvent</code> property names leave no mysteries to solve:</p>

<ul>
  <li><code class="language-plaintext highlighter-rouge">x</code> and <code class="language-plaintext highlighter-rouge">y</code>: the window position, and</li>
  <li><code class="language-plaintext highlighter-rouge">width</code> and <code class="language-plaintext highlighter-rouge">height</code>: the window dimensions.</li>
</ul>

<p>But breaking that info out can be a bit tricky, so let’s look at that in…</p>

<h2 id="the-onconfigureevent-callback">The onConfigureEvent Callback</h2>

<p>Here’s what we’re looking at:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">bool</span> <span class="n">onConfigureEvent</span><span class="p">(</span><span class="n">GdkEventConfigure</span><span class="p">*</span> <span class="n">event</span><span class="p">,</span> <span class="n">Widget</span> <span class="n">widget</span><span class="p">)</span>
<span class="p">{</span>
	<span class="k">if</span><span class="p">(</span><span class="n">event</span><span class="p">.</span><span class="n">type</span> <span class="k">is</span> <span class="n">EventType</span><span class="p">.</span><span class="n">CONFIGURE</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="n">xPosition</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">x</span><span class="p">;</span>
		<span class="n">yPosition</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">y</span><span class="p">;</span>
		<span class="n">width</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">width</span><span class="p">;</span>
		<span class="n">height</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">height</span><span class="p">;</span>
	<span class="p">}</span>
		
	<span class="k">if</span><span class="p">(</span><span class="n">isMaximized</span><span class="p">())</span>
	<span class="p">{</span>
		<span class="n">_isMaximized</span> <span class="p">=</span> <span class="kc">true</span><span class="p">;</span>
	<span class="p">}</span>
	<span class="k">else</span>
	<span class="p">{</span>
		<span class="n">_isMaximized</span> <span class="p">=</span> <span class="kc">false</span><span class="p">;</span>
	<span class="p">}</span>

	<span class="n">writeln</span><span class="p">(</span><span class="s">"Window position - x: "</span><span class="p">,</span> <span class="n">xPosition</span><span class="p">,</span> <span class="s">", y: "</span><span class="p">,</span> <span class="n">yPosition</span><span class="p">,</span> <span class="s">", Window area - width: "</span><span class="p">,</span> <span class="n">width</span><span class="p">,</span> <span class="s">", height: "</span><span class="p">,</span> <span class="n">height</span><span class="p">);</span>

	<span class="k">return</span><span class="p">(</span><span class="kc">false</span><span class="p">);</span> <span class="c1">// must be false or the window doesn't redraw properly.</span>
		
<span class="p">}</span> <span class="c1">// onConfigure()</span>
</code></pre></div></div>

<p>I’ll draw your attention to the function definition… this line:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">bool</span> <span class="n">onConfigureEvent</span><span class="p">(</span><span class="n">GdkEventConfigure</span><span class="p">*</span> <span class="n">event</span><span class="p">,</span> <span class="n">Widget</span> <span class="n">widget</span><span class="p">)</span>
</code></pre></div></div>

<p>We’re getting specific about the <code class="language-plaintext highlighter-rouge">Event</code> type so we can pull out information specific to the type of <code class="language-plaintext highlighter-rouge">Event</code>, in this case, a <code class="language-plaintext highlighter-rouge">GdkEventConfigure</code>… which, for some reason, didn’t get aliased to <code class="language-plaintext highlighter-rouge">EventConfigure</code> in the GtkD wrapper. Any-who…</p>

<p>We do have the option, with an overload to this function, to react to an ordinary <code class="language-plaintext highlighter-rouge">Event</code>, but that won’t give us all the <code class="language-plaintext highlighter-rouge">Window</code> stats.</p>

<p>Now let’s look a little further down:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">if</span><span class="p">(</span><span class="n">event</span><span class="p">.</span><span class="n">type</span> <span class="k">is</span> <span class="n">EventType</span><span class="p">.</span><span class="n">CONFIGURE</span><span class="p">)</span>
<span class="p">{</span>
	<span class="n">xPosition</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">x</span><span class="p">;</span>
	<span class="n">yPosition</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">y</span><span class="p">;</span>
	<span class="n">width</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">width</span><span class="p">;</span>
	<span class="n">height</span> <span class="p">=</span> <span class="n">event</span><span class="p">.</span><span class="n">height</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div></div>

<p>We grab all the values from the event and stuff them into our class properties. The <code class="language-plaintext highlighter-rouge">if()</code> statement is there just to make sure we didn’t go astray in our code somewhere in the preamble of this function.</p>

<h2 id="conclusion">Conclusion</h2>

<p>Now you know everything you need to know (perhaps more than you want to know) about gathering <code class="language-plaintext highlighter-rouge">Window</code> stats. Next time, we start a new series on hardware detection with <em>GTK</em>.</p>

<p>Until then…</p>

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		<a href="./0092-window-stats-ii-size.html">Previous: Window Stats - How Big is My Window?</a>
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